Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Other comprehensive income (before tax) [Abstract]
Change in unrealized gains and losses on investments	$ (126,175)		$ (78,546)		$ 31,662
Benefit plans adjustments	68,038		(1,221)		(19,789)
Unrealized foreign currency translation adjustment	(21,563)		2,452		(318)
Other comprehensive income (loss)	(79,700)		(77,315)		11,555
Other comprehensive income (tax) [Abstract]
Change in unrealized gains and losses on investments	43,732		27,510		(10,605)
Benefit plan adjustments	(23,813)		428		6,927
Unrealized foreign currency translation adjustment	7,553		(859)		111
Other comprehensive income (loss)	27,472		27,079		(3,567)
Other comprehensive income (valuation allowance) [Abstract]
Change in unrealized investment gains and losses, net	(41,148)		(27,623)		0
Benefit plan adjustments	23,813		(428)		0
Other comprehensive income foreign currency translation valuation allowance	0		0		0
Other comprehensive income (loss)	(17,335)		(28,051)		0
Other comprehensive income (net of tax) [Abstract]
Change in unrealized investment gains and losses on investments	(123,591)		(78,659)		21,057
Benefit plan adjustment	68,038		(1,221)		(12,862)
Unrealized foreign currency translation adjustment	(14,010)		1,593		(207)
Other comprehensive income (loss)	(69,563)		(78,287)		7,988
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	2,484		79,799		68,244
Other comprehensive income (loss) before reclassifications	(66,191)		22,867		85,974
Amounts reclassified from accumulated other comprehensive income (loss)	13,509		100,182		74,419
Net current period other comprehensive income (loss)	(79,700)		(77,315)		11,555
Balance at end of period, before tax	(77,216)		2,484		79,799
Tax effect	(40,510)	[1]	(50,647)	[1]	(49,675)	[1]
Total accumulated other comprehensive income (loss), net of tax	(117,726)		(48,163)		30,124
Tax Effect due to valuation allowance (in hundredths)	35.00%		35.00%		35.00%
Unrealized gains and losses on available-for-sale securities [Member]
Other comprehensive income (before tax) [Abstract]
Other comprehensive income (loss)	(126,175)		(78,546)		31,662
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	41,541		120,087		88,425
Other comprehensive income (loss) before reclassifications	(112,667)		22,710		105,167
Amounts reclassified from accumulated other comprehensive income (loss)	13,508	[2]	101,256	[2]	73,505	[2]
Net current period other comprehensive income (loss)	(126,175)		(78,546)		31,662
Balance at end of period, before tax	(84,634)		41,541		120,087
Tax effect	(64,056)	[1]	(66,640)	[1]	(66,526)	[1]
Total accumulated other comprehensive income (loss), net of tax	(148,690)		(25,099)		53,561
Defined benefit plans [Member]
Other comprehensive income (before tax) [Abstract]
Other comprehensive income (loss)	68,038		(1,222)		(19,789)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	(71,804)		(70,582)		(50,793)
Other comprehensive income (loss) before reclassifications	68,039		(2,296)		(18,875)
Amounts reclassified from accumulated other comprehensive income (loss)	1	[3]	(1,074)	[3]	914	[3]
Net current period other comprehensive income (loss)	68,038		(1,222)		(19,789)
Balance at end of period, before tax	(3,766)		(71,804)		(70,582)
Tax effect	26,940	[1]	26,940	[1]	26,940	[1]
Total accumulated other comprehensive income (loss), net of tax	23,174		(44,864)		(43,642)
Foreign currency translation [Member]
Other comprehensive income (before tax) [Abstract]
Other comprehensive income (loss)	(21,563)		2,453		(318)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period, before tax	32,747		30,294		30,612
Other comprehensive income (loss) before reclassifications	(21,563)		2,453		(318)
Amounts reclassified from accumulated other comprehensive income (loss)	0		0		0
Net current period other comprehensive income (loss)	(21,563)		2,453		(318)
Balance at end of period, before tax	11,184		32,747		30,294
Tax effect	(3,394)	[1]	(10,947)	[1]	(10,089)	[1]
Total accumulated other comprehensive income (loss), net of tax	$ 7,790		$ 21,800		$ 20,205

[1] Tax effect does not approximate 35% due to amounts of tax benefits not provided in various periods due to our tax valuation allowance.

[2] During 2013, 2012 and 2011, net unrealized gains of $13.5 million, $101.3 million and $73.5 million, respectively, were reclassified to the Consolidated Statement of Operations and included in Realized investment gains.

[3] During 2013, 2012 and 2011, other comprehensive income related to benefit plans of $1 thousand, ($1.1) million and $0.9 million, respectively, was reclassified to the Consolidated Statement of Operations and included in Underwriting and other expenses, net.